Let-off-arresting mechanism for looms.



No.. 7|0-,024. Patented Sept; 30, I902.

E. s. STIMPSON. 4 LET-OFF ARB ESTI'NG MECHANISM-FOR LOOMS.

(Application Med Apr. 28, 1902.

(No'ModqL) UNITED STATES PA; TENT @FFICE.

DRAPER COMPANY, OF HOPED TION 0F MAINE. I

ALE MASSACHUSETTS, A CORPORA- LET-OFF-ARRESTING MECHANISM FOR LOOMS.

SPECIFICATION formingpart of Letters Patent No. 710,024, dated September30, 1902.

Application filed April 28. 1902.

1'0 a whom, it may concern:

Be it known that I, EDWARD S. STIMPsoN, a citizen of the United States,residing at Hope dale, county of Worcester, State of Massachusetts, haveinvented an Improvement in Let-Off-Arresting Mechanism for Looms, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representinglike parts.

This invention relates to looms for weaving; and it has for one of itsobjects the production of means for arresting the operation of thelet-off mechanism when the normal running condition thereof istemporarily'interrupted-such, for instance, as by replenishment offilling in a loom provided with automatic replenishing mechanism or whenthe shuttle is improperly boxed and the loom bangs off. I

Another object of the invention is to provide for arrest of thetake-up'me'chanism when let-off is interrupted in order that the warpsmay not be subjected to any undue strain. p

In automatic filling-replenishing looms the act of replenishment takesan appreciable, though very short, time, varying from one to three orfour picks, according to the type of replenishing mechanism employed,and unless the let-off is arrested the warps will be improperlyslackened, tending to make a thick place in the cloth. If tl1e take-upcontinues in operation when the let-off isarrested, it will be manifestthat the warps will be strained, so it is absolutely necessary inworking with some kinds of yarn that both take-up and let-off bearrested, and provision is herein made for so doing.

Many looms are provided with warp stopmotions wherein upon .breakage orundue Serial No. 104,971. (No model.)

necessary. By arresting the let-0E this slackness of the warps isprevented.

The various novel features of my invention will be hereinafterdescribed, and particle larly pointed out in the following claims.

Figure 1 is a right-hand side elevation of a portion aloom with oneembodiment of my present invention applied thereto, an automaticfilling-replenishing loom being illustrated. Fig. 2 is a detail, to bereferred to, of a part of the means for arresting the takeup mechanism;and Fig. 3 isa rear elevation on the line a: 00, Fig. 1, looking towardthe left, of a locking device for maintaining the let-off mechanisminoperative when its operation'has been arrested. 7

The lay A breast-beam A and the protector mechanism, including a frog 0,the dagger d on the usual protector-shaft carried by the lay and havingthe arm or finger (1 adapted to be moved by the binder d of theshuttle-box D when the shuttle is improperly boxed, may be and are allsubstantially as in United Stated Patent No. 692,911, dated February 11,1902, wherein if the shuttle is improperly boxed the dagger d willengage the frog 0 on the forward beat of the lay to release the shippingmechanism, (not shown,) of any usual or Well-known construction.

The filling-replenishing mechanism inw cludes a feeder or hopper F,mounted on the breast-beam.and adapted to contain the filling-supplieslffltransferred singly to the shuttle by the transferrerf upon theoccurrence of an abnormal condition of the filling, such as. its failureor exhaustion to a predeterwhich the whip-roll NV is rotatably mounted,a depending arm on, having attached to it one end of a spring S, theother end thereof being secured to the loom-frame, the spring actingupon the whip-roll in opposition to the pull of the warps, substantiallyas in Patent No. 692,911, referred to.

At the right-hand side of the loom the rockshaft m has secured to it anupturned arm m (see dotted lines, Fig. 1,) to which is pivotallyconnected a link M, the latter being jointed at its forward end with thefrog 0 at m Fig. 1, so that forward movement of the frog will swing thewhip-roll toward the front of the loom to slacken or release the warpsfrom normal tension, as in said patent.

Herein I have shown an arm m secured to the rock-shaft mat theright-hand side of the loom, and said arm has pivoted to it a link a,which is hooked at a to loosely embrace a headed stud a on the member cof the pawlcarrier for the let-ofi mechanism fulcrumed at c on the loomside.

The let-off mechanism herein illustrated comprises the warp-beam 13,having an attached gear B, the ratchet-wheel B cooperatingactuating-pawl d ,compound pawl-carrier c d, link (1, connected with thelay-sword A and the arm E, having a roll E to engage the periphery ofthe yarn mass on the beannsubstantially as shown in United States PatentNo. 647,815, dated April 17, 1900, though any other-suitablepositively-actuated let-0E mechanism may be employed.

The variations in warp tension act through the link a in opposition tothe spring S to move the pawl-carrier on its fulcrum, as in Patent No.647,815, and when the whip-roll is positively moved to slacken thewarps, as described, the hook a permits the link a to slide on the studa A pawl-controller, shown as a bent arm h h, is fulcrumed on the loomside at W, the heavier part h of said arm being extended forward andhaving a lateral projection 73* thereon (see dotted lines, Fig. 1) inthe path of movement of a depending rocker-arm (1, fast on therock-shaft d, the said controllerarm normally occupying the positionshown. The part 7; thereof is rearwardly extended and is provided withan elongated curved flange 7L3, projecting laterally therefrom and abovea tail d on the pawl (1 so that when the rocker-arm d lifts the end h ofthe controller-arm the flange will be depressed and engage the tail ofthe pawl (1 and depress it, rendering said pawl inoperative. A camledgeh is made on the side of the part h of the controller-arm (see Figs. 1and 3) to cooperate with the hook-like end of a lockingdetent 71fulcrumed at h on a bracket A fast on the loom side, the lower end ofthe detent being weighted, as at h and having a convex outer edge hNormally the upper end of the detent rests against the outer face of thecam-ledge, as shown, and the convex face 71 is held out of the path of areleasing device, shown asa tappet or wiper 0 on the cam-shaft (3 of theloom. When, however, the rock-shaft d is turned in the direction ofarrow 10, Fig. 1, as upon a change of filling, the rocker-arm d willtilt the controller-arm and the pawl d of the let-off mechanism will berendered inoperative, thereby arresting the let-off, and at the sametime the hooked end of the detent 71 will swing inward and hook over thetop of the cam-ledge 72,", holding the controller-arm in abnormalposition and maintaining pawl d inoperative. The parts will be so helduntil the releasing device 0 comes into engagement with the curved edgeh of the detent, and thereupon the weighted end it of the latter will bepressed inward, throwing the hooked end off the cam-ledge and releasingthe controller-arm, which returns to normal position. Such locking ofthe controller-arm maintains the let-off inoperative for a predeterminednumber of picks while filling replenishing is effected.

When the shuttle is improperly boxedas, for instance, when the loombangs 0fithe forward movement of the whip-roll causes the arm m to bedepressed, moving the lower end of the link a against a lug h (seedotted lines, Fig. 1) on the end 72/ of the controllerarm, depressing itso that, as before, the pawl 01 will be rendered inoperative, thelocking-detent 71 at such time acting to maintain the let-off mechanisminoperative until the releasing device 0 disengages the detent andreleases the controllerarm.

The take-up mechanism may be of any usual construction, and I haveherein shown only the actuating-ratchet T thereof and itscooperating-pawl T, the latter being mounted on the pawl-carrier T andoperated in well-known manner, the pawl being located on the side of thepawl-carrier and a detentpawl T In Fig. 1 the arm d fast on theoperating or controlling rock-shaft d, is shown as provided with a longdepending extension (Z having a lateral stud (Z at its lower end, whichbears against the short arm tof a bent lever 25 t, fulcrumed at I? onthe loom side and shown separately in Fig. 2. The long arm i normallyextends beneath the take-up pawl 6 and it has a cam-like dependingextension 29.

When the rock-shaft d is turned in the direction of arrow 10, Fig. l,the extension (1 is swung inward, and the stud d which is below thefulcrum t acts upon the leverarm 15 to depress it, and thereby raise thearm t, the latter lifting the take-up pawl T and disengaging it from theratchet T, so that take-up is arrested. The long extension (1 actingupon the short arm t of the lever 25 t acts with such increased leverageas to elevate the long arm t so high that the pawl T is removed aconsiderable distance from the ratchet T, the cam-like extension t beingbrought in front of the pawl and holding it inoperative until return ofthe lever 1ft to normal position. (Shown in Fig. 1.)

I have simplified the take-up mechanism by omitting let-back pawls, orother devices which are usually provided, to prevent the formation ofthin places in the cloth when the take-up is arrested, and I use hereina simple detent-pawl 6 which is fulcrumed on the stud 1%.

To compensate for the omission of let-back pawls and prevent the take-upfrom being I brought into operation too soon after its arrest,

the increased movement of the take-up pawl away from the ratchet isprovided, the time necessary for the pawl to return to engagement withthe ratchet being sufficient to insure non-operation of the take-upduring the picks required for a change or replenishment of filling. Inthis manner the formation of thin places in the cloth is preventedwithout employing any devices for letting back the take-up mechanismwhen it is arrested.

I have shown herein one practical embodiment of my invention, andvarious changes or modifications in details of construction orarrangement may be made by those skilled in the art without departingfrom the spirit and scope of the invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a loom, filling-replenishing mechanism, let-off mechanism, andmeans to temporarily arrest the operation thereof upon actuation of thereplenishing mechanism.

2. In a loom, let-01f mechanism, means operative by or through anabnormal condition of the filling to arrest the operation of saidmechanism, and a device to release the latter from the control of saidmeans after a predetermined number of picks.

3. In a loom, a controlling rock-shaft, letoff mechanism, means to turnsaid rock-shaft by or through an abnormal condition of the filling, andconnections between said rockshaft and let-off mechanism, to temporarilyarrest the latter when the former is turned.

4. In a loom, filling-replenishing mechanism, let-ofi' mechanism, meansto arrest its operation when the replenishing mechanism is actuated, anda device to automatically release the let-oft mechanism from the controlof said means.

5. In aloom provided with automatic fillingreplenishing mechanism,let-off mechanism including an actuating-pawl, means operated by orthrough actuation of the replenishing mechanism to render the pawlinoperative, said means including a locking-detent, and a device to actupon the detent and automatically release the let-off mechanism fromcontrol of said means after a predetermined num+ ber of picks.

6. In a loom, filling-replenishing mechanism, let-off mechanism, acontroller-arm operated upon filling replenishing to render the pawlinoperative, a detent to engage and lock said arm at such time, tomaintain the let-off inoperative, and a device to act upon the detentafter a predetermined number of picks and release the controller-arm, tothereby restore the let-oft to operative condition.

'7. In a loom, let-off mechanism, means to arrest the operation thereofby or through an abnormal condition of the filling, and separate meansto arrest the operation of said mechanism when the loom bangs off.

8. In a loom, let-off mechanism, including an actuating-pawl, a deviceto act upon and render it inoperative, and two separate means to actuatesaid device, one of said means being operative by or through an abnormalcondition of the filling, and the other being operative when the loombangs off.

9. In an automatic filling-replenishing loom, let-elf mechanism, meansto arrest its operation upon filling replenishing, and separate means toarrest the operation of said mechanism when the shuttle is improperlyboxed.

10. In a loom, a movable whip-roll, let-oft mechanism, including anactuating-pawl, means operative upon improper boxing of the shuttle topositively move the whip-roll to slacken the warps, and a deviceoperative by such movement of the whip-roll to render the actuating-pawlinoperative and thereby arrest the let-ofi mechanism.

11. In a loom, a movable whip-roll,-let-off mechanism, including anactuating-pawl, means operative upon improper boxing of the shuttle topositively move the whip-roll to slacken the warps, a controller-arm forthe pawl, actuated by such movement of the whip-roll to engage andrender the pawl inoperative, a detent to engage the arm and maintain itin engagement with the pawl, and a device to automatically release thecontroller-arm from the detent after apredetermined number of picks.

12. In a loom provided with automatic filling-replenishing mechanism,means to gov cm the time of operation thereof, take-up and let-oftmechanisms, and separate controlling connections between said mechanismsand the said governing means, to arrest the takeup and let-off uponactuation of the replenishing mechanism.

13. In a loom provided with filling-replenishing mechanism, means togovern the time of operation thereof, a movable whip-roll, meansoperative upon improper boxing of the shuttle to positively move thewhip-roll and slacken the warps, let-off mechanism, including anactuating-pawl, a normally inoperative vice to automatically act uponthe detent and move it to release the controller-arm and permit it toreturn to inoperative position, the cam-ledge thereafter acting to holdthe detent out of the path of movement of said device until thecontrollenarm is again moved and locked.

14. In a loom provided with automatic filling-replenishing mechanism,means to govern the time of operation thereof, take-up mechanism,including an actuating pawl and ratchet, and a device controlled by saidgoverning means to disengage the pawl and ratchet upon operation of saidgoverning means and maintain such disengagement during fillingreplenishing.

